Move e-payment to Settings and add ZarinPal credentials.

Gateway config now lives on the general Settings page, with Mellat fields in a 3-column layout and ZarinPal available at checkout.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/business/src/components/SearchableSelect.module.css

@@ -69,31 +69,29 @@
 }
 
 .dropdown {
-  position: absolute;
-  top: calc(100% + 6px);
-  left: 0;
-  right: 0;
-  max-height: 220px;
-  overflow-y: auto;
+  position: static;
+  margin-top: 6px;
+  max-height: none;
+  overflow: visible;
   background: rgba(255, 255, 255, 0.95);
   backdrop-filter: blur(16px);
   -webkit-backdrop-filter: blur(16px);
   border: 1px solid var(--glass-border);
   border-radius: var(--radius-sm);
   box-shadow: 0 8px 24px rgba(31, 38, 135, 0.12);
-  z-index: 10;
   list-style: none;
   padding: 6px;
   animation: dropdownIn 0.15s ease;
 }
 
-/* Prefer for selects inside overflow-clipped modals — expands parent instead of clipping. */
+/* Alias — in-flow is the default so search results expand the parent modal. */
 .dropdownInFlow {
   position: static;
   top: auto;
   left: auto;
   right: auto;
-  max-height: min(50vh, 400px);
+  max-height: none;
+  overflow: visible;
   margin-top: 6px;
   z-index: auto;
 }